Fit a non-return valve to the domestic cold water circuit.
Install a dielectric union on the domestic cold water inlet.
Pressure reducer
If the supply pressure exceeds 80% of the safety valve or unit calibration
(e.g.: 0.55 MPa/5.5 bar for a safety unit calibrated to 0.7 MPa/7 bar), a
pressure reducer must be located upstream of the appliance.
Install the pressure reducer downstream of the water meter in such a way
as to ensure the same pressure in all of the system's pipes.
Measures to take to prevent hot water flow return
Fit a non-return valve to the domestic cold water circuit.
5.6.2
Connecting to a boiler (TWH 300 EH model)
Caution
Before attaching the water connections for the heating circuit and
domestic hot water tank heat exchanger, the circuits must be
flushed to remove any particles which might damage the
components (safety valve, pumps, valves, etc.).
Fig.14
MW-C003613-2
A
A Boiler
1 Heating flow
2 Heating return
3 Safety valve
4 Pressure gauge
7 Automatic air vent
9 Isolation valve
11 Heating pump
16 Expansion vessel
17 Drain valve
5 Installation
26
300026515 - v10 - 28082018
